collins



H. G. COLLINS. LIQUID DOOR CHECK. No. 577,721. Patented Feb. 23, 1397.

ql .D I

5 H7 1 fli J q'/ H l/ I I I 3 J4 I J" .76 fl"' \e'\ Jr UNITED STATES PATENT OFFICE.

HERBERT G. COLLINS, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO THE SARGENT & COMPANY, OF SAME PLACE.

LIQUID DOOR-CHECK.

SPECIFICATION forming part of Letters Batent No. 577,721, dated February 23, 1897. Application filed. February 25, 1896. Serial No. 580,709. (No model.)

To aZZ whom it may concern.-

Be it known that I, HERBERT G. COLLINS, of New Haven, in the county of New Haven and State of Connecticut, have invented a new Improvement in Liquid Door-Checks; and I do hereby declare the following, when taken in connection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, 1n-

Figure 1, a plan view of a door-check containing my invention Fig. 2, a View thereof in vertical section on the line a Z) of Fig. 1 Fig. 2 a similar view, but showing the parts of the check in the positions which they have when the door is open Fig. 3, a plan view of the check, the parts of the check being removed down to the cam-head; Fig. 4, a re verse plan view of the spindle-head; Fig. 5, a view in side elevation of the cam-head; Fig. 6, a detached reverse plan view thereof.

My invention relates to an improvement in fluid door-checks, the object being to produce a simple and effective device constructed with particular reference to the use of few and strong parts, not liable to breakage or derangement.

WVith these ends in view my invention consists in a fluid door-check having certain details of construction and combinations of parts, as will be hereinafter described, and pointed out in the claims.

In carrying out my invention, as herein shown, I employa case or cylinder A, having its bottom cast integral with it and furnished with a removable flanged cap. or cover 13. Within the case I locate an annular diaphragm C, resting upon an annular shoulder A, formed within the case, the diaphragm being secured in place by means of screws 0. The said diaphragm virtually divides the case into a spring-chamber A and a fluid-chamber A the said spring-chamber containing a coiled spring D, the outer end of which is connected with the case in the usual manner, while its inner end is connected, also in the usual manner, with a rotary sleeve E, extending downward to the bottom of the said chamber and provided at its outer end, which extends upward through the cap B, with an integral I ratchet-wheel E, the teeth of which are engaged by a pawl F, pivoted upon the under face of the inner end of the member G of the two-part operating-lever, comprising also a member G. The said two-part operating-lechambered head H the exterior periphery of which fits within the central opening 0 of the diaphragm C. An outwardly-projecting flange H formed upon the lower portion of the head, engages with the lower face of the diaphragm and holds the head and shaft against being moved outwardly. If desired, the head may have a circumferential packinggroove H, as shown in Fig. 2, although this is not imperative. As shown in the said ligure, the sleeve E impinges against the outer face of the head. The lower face of the head is constructed with a centrally-arranged annular recess H which I shall henceforth speak of as a cam-recess, because it is provided for the reception of the lifting-cam I,

:ver may be of any approved construction. I Q The inner end of the member G of the said formed upon the upper face of the disk-shaped cam-head I.

Leading out of the top of the recess 1-1 is a recess H, which I shall henceforth call the stem-recess, because it is adapted to receive and give clearance to the upwardly-extending vertically-movable stem J of the plunger J. Leading out of the center of the top of the stem-recess H is a counterbore H which receives and affords a clearance for the bearing J formed at the upper end of the said stem. The recesses H and H are intersected by a radially-arranged coupling-slot.

H provided for the reception and vertical movement of a lifting and coupling pin J mounted in the upper portion of the stem J and coacting with the lifting-cam I, before mentioned. So far as the coupling function of the pin J is concerned,it connects the stem ICO rotation within the liquid-chamber,its periphery being thereto constructed with three notches j, which are taken into by vertical ribs extending into the chamber and formed integral with the case, which is also constructed with a shoulder A limiting the downward movement of the head. The said cam-head is held in engagement with the shoulder A by the engagement with its upper face of the lower face of the spindle -head. Upon its lower face the said cam-head is constructed with a doubly-beveled cam 1 located in direct opposition to the doubly-beveled liftingcam I, formed upon the upper face of the head, as clearly shown in Fig. 5. The said cam I I shall henceforth call the depressing-cam, because its function is to depress the plunger J. Two ports I 1 formed in the head, permit the fluid to circulate above and below the same. The depressing-cam I ooacts with a depressing-pin J mounted in the plunger-stem J at a point below the cam-head I, and, as herein shown, furnished with an antifriction-roll J These pins J 3 and J 4 are located one above the other, as will be observed by reference to Fig. 2. The plunger J, which is located in the lower portion of the liquid-chamber A is adapted in diameter to clear the walls thereof, so as to be free to move up and down'and rotate. It is formed with ports or passages J for the free passage of the liquid downward through it as the plunger is lifted in opening the door, and provided with a large plate-valve J covering all of the passages J 6 and suspended from the center of the plunger by means of a pin J long enough only to give the valve very limited'vertical movement for opening and closing the ports J The controlled passage of the liquid from a point below to a point above the plunger is provided for by means of two ports K and K, located one above the other in the lower portion of the case and intersecting at their outer ends the long vertical passage K which receives the stem-valve K The said. valve-stem K projects at its upper end above thecase and is furnished with an operating-pin K and threaded, as at K about midway of its length. The lower end of this valve is constructed with a longitudinal slot K affording communication between the ports K and K and means for regulating the flow of the liquid. When the slot is in full alinem cut with the ports, the flow of the liquid will be the freest, but when virtually reduced in size by being turned into only partial alinement with the ports the flow of the liquid will be restrained. I do not, however, limit myself to. any particular kind of valve for controlling the flow of liquid as described.

Having now described the construction of myimproved door-check, I will proceed to set forth its mode of operation.

Normally, that is, when the door with which the device is connected is closed, the plunger J will be located in the bottom of the liquidchamber, as shown in Fig. 2, with the liquid above it. Now when the door is opened the sleeve E will be rotated for winding up the spring D, and the spindle II, and hence its head H will also be rotated, the rotation of the latter being communicated through the lifting and coupling pin J to the plungerstem J and hence to the plunger J. Just as soon as the rotation of the spindle begins to move. the lifting and coupling pin J the same is caused to ride up upon the lifting-cam I, whereby the plunger-stem and plunger are lifted in the liquid -chamber, allowing the plate-valve J 7 to open and clear the ports J through which the liquid finds a free passage into the lower portion of the liquid-chamber at a point below the plunger. It will be understood that this lifting action of the plunger takes place slowly, so that it is not fully lifted until at about the time the door is open. Now when the door begins to swing back under the effort of the spring A to uncoil, the depressing-pin J 4 will begin to ride up the depressing-cam 1 so as to immediately begin to move the plunger-stem and plunger downward. At the beginning of this movement the liquid below the plunger is compressed, with the effect of closing the plate-valve, after which the transference of the liquid from a point below the plunger to a point above the same must be through the port K and the passage K and the port K, and as this passage is a small one the transference of the liquid will be slow. The downward movement of the plunger is therefore restrained and controlled in exact accordance with the rapidity with which the liquid is allowed to flow through the port K, the passage K and the port K, and that will depend upon the position of the stem-valve K The downward movement of the plunger and hence the closing of the door will therefore be controlled by the slow passage of the liquid from a point below the plunger to a point above the same. It will be understood that on account of the arrangement of the lifting and depressing cams in opposition toeach other the depressing-pin clears the depressing-cam at the time the lifting and coupling pin is coacting with the lifting-cam, and Vice versa. These cams are made double, so as to adapt the check to be converted for right and left hand doors.

It is apparent that in carrying out my in-.

vention some changes from the construction herein shown and described may be made, andI would therefore have it understood that I do not limit myself to the exact construction herein shown, but hold myself at liberty to make such changes and alterations as fairly fall within the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a liquid door-check, the combination with the case thereof, of a spindle, a vertically-movable and rotary plunger provided with a stem coupled for rotation with the spindle, a lifting-pin located at the upper end of the stem, a depressing-pin located at the lower end thereof, and a non-rotatable camhead interposed between the two pins, and provided upon its upper face with a liftingcam to coact with the lifting-pin and upon its lower face with a depressing-cam to coact with the depressing-pin.

2. In a liquid door-check, the combination with the case thereof, of a spindle located therein and provided at its lower end with a circular, chambered head, an annular diaphragm located within the case and forming a bearing for the said head, a vertically-movable and rotatable plunger located within the lower portion of the said case, and provided with a stem which is coupled with the head for rotation therewith, a lifting-pin connected with the upper end of the stem, a depressingpin located at the lower end of the stem, and a non-rotatable cam-head interposed between the two pins, and provided upon its upper face with a lifting-cam to coact with the lifting-pin and upon its lower face with a depressing-cam to coact with the depressing-pin.

3. In a liquid door-check, the combination with the case thereof, of a spindle mounted therein and provided at its lower end with a circular chambered head, an annular diaphragm located within the ease and forming a bearing for the said head, a vertically-movable and rotatable plunger located within the lower portion of the case and provided with a stem, the upper end of which enters the said chambered head which affords a bearing for it, a lifting-pin connected with the upper end of the stem and entering a clearance-slot formed in the said head, a depressing-pin located at the lower end of the stem, and a nonrotatable cam-head interposed between the two pins and provided upon its upper face with a lifting-cam to coact with the liftingpin and upon its lower face with a depressingcam to coact with the depressing-pin, substantially as described. a

4. In a liquid door-check, the combination with a case, of a diaphragm located therein and dividing it into a spring-chamber and a liquid-chamber, a spindle located in the case, and provided at its lower end with a'circular head having bearing in the diaphragm, and constructed with a cam-recess, a stem-recess, and a coupling-slot, a vertically-movable and rotary plunger located in the lower portion of the liquid-chamber, a plunger-stem rigidly connected at its lower end with the plunger, and extending upward into the stem-recess, a combined lifting and coupling pin mounted in the upper end of the stem, and extending into the coupling-slot aforesaid, a depressingpin mounted in the lower end of the stem, and a cam-head located between the said chambered head and plunger, and provided upon its upper face with a lifting-cam entering the cam-recess in the head, and coacting with the lifting and coupling pin, and upon its lower face with a depressing-cam, which coacts with the depressing-pin.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

HERBERT G. COLLIN S.

Witnesses:

HARRY W. MESBURNE, WILLIAM S. OooKE. 

